class_docstr: Sub-lexer for raw E-mail. This lexer only process header part of e-mail.
  
  .. versionadded:: 2.5
code: def __init__(self, **options):
      super(EmailHeaderLexer, self).__init__(**options)
      self.highlight_x = get_bool_opt(
          options, "highlight-X-header", False
      )
  
file_path: catboost/contrib/python/Pygments/py2/pygments/lexers/email.py
imports: from pygments.lexer import RegexLexer, DelegatingLexer, bygroups
  from pygments.lexers.mime import MIMELexer
  from pygments.token import Text, Keyword, Name, String, Number, Comment
  from pygments.util import get_bool_opt
label_desc: Use image node_id 1 to create a new EmailHeaderLexer object from inherited base classes: RegexLexer with example: obj = EmailHeaderLexer()